Spring Boot学习入门之整合Druid数据源

有两种方式整合。

一、传统方式

1.1 加入依赖包

		<!-- springboot,druid 整合包 -->
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid-spring-boot-starter</artifactId>
			<version>1.1.9</version>
		</dependency>
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>fastjson</artifactId>
			<version>1.2.47</version>
		</dependency>
		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<version>1.2.17</version>
		</dependency>

如果引入传统的依赖包

		<!-- springboot,druid 整合包 -->
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid-spring-boot-starter</artifactId>
			<version>1.1.9</version>
		</dependency>

则druid页面中SQL监控不会出现执行的SQL

1.2 在application.properties配置文件中加入添加：

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource

# 初始化大小，最小，最大  
spring.datasource.initialSize=5
spring.datasource.minIdle=5
spring.datasource.maxActive=20
# 配置获取连接等待超时的时间  
spring.datasource.maxWait=60000
# 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒  
spring.datasource.timeBetweenEvictionRunsMillis=60000
# 配置一个连接在池中最小生存的时间，单位是毫秒  
spring.datasource.minEvictableIdleTimeMillis=300000
# 校验SQL，Oracle配置 spring.datasource.validationQuery=SELECT 1 FROM DUAL，如果不配validationQuery项，则下面三项配置无用  
spring.datasource.validationQuery=SELECT 'x'
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
# 打开PSCache，并且指定每个连接上PSCache的大小  
spring.datasource.poolPreparedStatements=true
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
# 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙  
spring.datasource.filters=stat,wall,log4j
# 通过connectProperties属性来打开mergeSql功能；慢SQL记录  
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
# 合并多个DruidDataSource的监控数据  
spring.datasource.useGlobalDataSourceStat=true

1.3 新建监控拦截器DruidStatFilter.java

/**
 * 配置监控拦截器 druid监控拦截器
 * 
 */
@WebFilter(filterName = "druidWebStatFilter", urlPatterns = "/*", initParams = {
		@WebInitParam(name = "exclusions", value = "*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*"),// 忽略资源
})
public class DruidStatFilter extends WebStatFilter {

}

1.4 新建druid监控DruidStatViewServlet.java。

@WebServlet(urlPatterns = "/druid/*", initParams = { 
		//@WebInitParam(name = "allow", value = ""), // IP白名单(没有配置或者为空，则允许所有访问)
		//@WebInitParam(name = "deny", value = ""), // IP黑名单 (存在共同时，deny优先于allow)
		@WebInitParam(name = "loginUsername", value = "admin"), // 用户名
		@WebInitParam(name = "loginPassword", value = "123456"), // 密码
		@WebInitParam(name = "resetEnable", value = "false")// 禁用HTML页面上的“Reset All”功能
})
public class DruidStatViewServlet extends StatViewServlet {

	private static final long serialVersionUID = 1L;

}

1.5 新建配置类DruidConfiguration.java

import java.sql.SQLException;
import java.util.Arrays;

import javax.sql.DataSource;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;

import com.alibaba.druid.filter.Filter;
import com.alibaba.druid.filter.stat.StatFilter;
import com.alibaba.druid.pool.DruidDataSource;

@Configuration
public class DruidConfiguration {
	@Value("${spring.datasource.url}")
	private String dbUrl;
	@Value("${spring.datasource.username}")
	private String username;
	@Value("${spring.datasource.password}")
	private String password;
	@Value("${spring.datasource.driver-class-name}")
	private String driverClassName;
	@Value("${spring.datasource.initialSize}")
	private int initialSize;
	@Value("${spring.datasource.minIdle}")
	private int minIdle;
	@Value("${spring.datasource.maxActive}")
	private int maxActive;
	@Value("${spring.datasource.maxWait}")
	private int maxWait;
	@Value("${spring.datasource.timeBetweenEvictionRunsMillis}")
	private int timeBetweenEvictionRunsMillis;
	@Value("${spring.datasource.minEvictableIdleTimeMillis}")
	private int minEvictableIdleTimeMillis;
	@Value("${spring.datasource.validationQuery}")
	private String validationQuery;
	@Value("${spring.datasource.testWhileIdle}")
	private boolean testWhileIdle;
	@Value("${spring.datasource.testOnBorrow}")
	private boolean testOnBorrow;
	@Value("${spring.datasource.testOnReturn}")
	private boolean testOnReturn;
	@Value("${spring.datasource.poolPreparedStatements}")
	private boolean poolPreparedStatements;
	@Value("${spring.datasource.maxPoolPreparedStatementPerConnectionSize}")
	private int maxPoolPreparedStatementPerConnectionSize;
	@Value("${spring.datasource.filters}")
	private String filters;
	@Value("${spring.datasource.connectionProperties}")
	private String connectionProperties;
	@Value("${spring.datasource.useGlobalDataSourceStat}")
	private boolean useGlobalDataSourceStat;

	@Bean // 声明其为Bean实例
	@Primary // 在同样的DataSource中，首先使用被标注的DataSource
	public DataSource dataSource() {
		DruidDataSource datasource = new DruidDataSource();
		datasource.setUrl(this.dbUrl);
		datasource.setUsername(username);
		datasource.setPassword(password);
		datasource.setDriverClassName(driverClassName);

		// configuration
		datasource.setInitialSize(initialSize);
		datasource.setMinIdle(minIdle);
		datasource.setMaxActive(maxActive);
		datasource.setMaxWait(maxWait);
		datasource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);
		datasource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);
		datasource.setValidationQuery(validationQuery);
		datasource.setTestWhileIdle(testWhileIdle);
		datasource.setTestOnBorrow(testOnBorrow);
		datasource.setTestOnReturn(testOnReturn);
		datasource.setPoolPreparedStatements(poolPreparedStatements);
		datasource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize);
		datasource.setUseGlobalDataSourceStat(useGlobalDataSourceStat);
		try {
			datasource.setFilters(filters);
			datasource.setProxyFilters(Arrays.asList(statFilter()));
		} catch (SQLException e) {
			System.err.println("druid configuration initialization filter: " + e);
		}
		datasource.setConnectionProperties(connectionProperties);
		return datasource;
	}

	@Bean
	public Filter statFilter() {
		StatFilter filter = new StatFilter();
		filter.setSlowSqlMillis(5000);
		filter.setLogSlowSql(true);
		filter.setMergeSql(true);
		return filter;
	}

1.6 进入Application.java，加入@ServletComponentScan注解

@ServletComponentScan
@SpringBootApplication
public class Application extends SpringBootServletInitializer {
	@Override
	protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
		return application.sources(Application.class);
	}

	public static void main(String[] args) {
		SpringApplication.run(Application.class, args);
	}
}

右键Run. 访问http://localhost:8080/druid/login.html

用户名，密码在DruidStatViewServlet.java，输入

二、第二种方式，不用新建DruidStatFilter.java和DruidStatViewServlet.java 将DruidConfiguration.java 修改为如下：

import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;

@Configuration
public class DruidConfiguration {
	@Bean
	public ServletRegistrationBean<StatViewServlet> statViewServlet() {
		// 创建servlet注册实体
		ServletRegistrationBean<StatViewServlet> servletRegistrationBean = new ServletRegistrationBean<StatViewServlet>(new StatViewServlet(), "/druid/*");
		// 设置ip白名单
		//servletRegistrationBean.addInitParameter("allow", "127.0.0.1");
		// 设置ip黑名单，如果allow与deny共同存在时,deny优先于allow
		//servletRegistrationBean.addInitParameter("deny", "192.168.0.19");
		// 设置控制台管理用户
		servletRegistrationBean.addInitParameter("loginUsername", "druid");
		servletRegistrationBean.addInitParameter("loginPassword", "123456");
		// 是否可以重置数据
		servletRegistrationBean.addInitParameter("resetEnable", "false");
		return servletRegistrationBean;
	}

	@Bean
	public FilterRegistrationBean<WebStatFilter> statFilter() {
		// 创建过滤器
		FilterRegistrationBean<WebStatFilter> filterRegistrationBean = new FilterRegistrationBean<WebStatFilter>(new WebStatFilter());
		// 设置过滤器过滤路径
		filterRegistrationBean.addUrlPatterns("/*");
		// 忽略过滤的形式
		filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
		return filterRegistrationBean;
	}
}

运行，结果略

来源：oschina

链接：https://my.oschina.net/u/3856404/blog/1810802

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Spring Boot